Same domain name, two systems

I have a client with a Windows 2000 server called HansonServ1 and serving a domain called Hanson.local.  They are changing accounting systems and adopting new PC's and a new server. The new accountng system will only be used on the new PCs and the new server.  I prep'd the new server with Windows Server 2012 Essentials and assigned it to provide the same domain name (Hanson.local), and named the server HansonServer with the expectation these two servers would not be running at the same time.

As it turns out, they will be running parallel for an undetermined time.   No computer will be present on both domains.

When i try to connect a client computer to the new server with the connect http://HansonServer/connect I an able to enable the connector, and enter an account only available on the new server, but receive the error "Cannot connect this computer to the network.  An unexpected error has occurred"

I'm concerned that the domains are clashing and will be a major issue.

What would you suggest i do to get these PC's connected, and if necessary to change the Domain name to which they will be connecting?  

Thanks so much for your guidance here.

mlitin
Mark LitinOwnerAsked:
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Hypercat (Deb)Commented:
Are the servers on the same physical network?  Unless the two servers are on completely separate physical networks with no routing between them, then the workstations won't be able to discern which "Hanson.local" domain they belong to.

Also, if the workstations you're trying to join to the new domain formerly belonged to the old one, you need to make sure that they've been completely removed from the old domain (from the workstation perspective) first before you try to join them to the new domain.
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David Johnson, CD, MVPOwnerCommented:
Server essentials must hold all FSMO roles and the domain cannot be at 2000 level..
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Mark LitinOwnerAuthor Commented:
Thanks for the quick response David.

I'm not really following what you wrote.  There are two separate servers, one running Win 2000 server and the other Server 2012 Essentials, both presenting the same domain.  If this means I need to change the domain on the Win 2012 Essentials machine, how would i go about that?  It's a small business with a single server and half a dozen PS's using it a a file server.

Thanks!
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Mark LitinOwnerAuthor Commented:
Hi hypercat.

Yes. The same Physical network.  So the condition you suggested exists. Thus I will change the domain on the new server since only the new PCs will connect to the new domain.  I've found two identical and  explicit instructions as to how to change the domain name,  So I feel pretty confident about that.

Thanks much for the assist.

Cheers!
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Mark LitinOwnerAuthor Commented:
Thanks for assist!
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